But this would probably make some or many PDFs unreadable. I've shortly considered to apply a gray-ish background to the PDF with the help of pdftk. The question would remain: what IS a "suitable" ICC color profil for your purpose?
However, you might be able to achieve a similar thing by applying a suitable ICC color profile to the input PDF and produce, with the help of (a very recent version of) Ghostscript, a new output PDF from this. The PDF remains the same during and after viewing it. What you describe for Adobe Reader does not change the PDF file itself, it changes the way the application renders the pages (by inverting colors, or similar). (Because in the general case, you'll have to change all colors of the PDF pages, not just the background alone, so you can still have some contrast and color differences.) What apps do you usually use to edit your PDF files? Let us know in the comments section below.There is no way to do this directly, with no (Free Software or gratis) tool I'm aware of. You don’t have to settle with the same old PDF files, but customize them and express your creativity. There are a lot of other options, like changing background, adding decorations, etc. There are a lot of amazing features you can use, so why not explore them! ExploreĬhanging text color is just one of the things you can do with a PDF file. You can change text color in your PDF in a couple of clicks, without even having to register! However, if you wish to explore additional options on this website, you may need to create an account. Also, you can make your text Bold or Italic, as you would with a Word document. Just click on one of the options, next to Color. You can apply the same method if you want to change the font or size of your text. Choose one of the colors from their broad palette.Select the text whose color you want to change.Click on the Upload PDF file button and choose the file from your computer.All you have to do is click on the “Page Background” option instead of “Document Text.” Again, you can choose from various tones for your background. In the same way that you change text color, you can also change the background color. You cannot highlight and change just the selected text’s color. Note: Changing PDF text color in Adobe Reader only changes the entire document (with certain exclusions). You can choose from a broad palette of colors or even make your own color. If you followed the steps correctly, your selected PDF text color should appear in the document. Choose your new text color from the pallette.If this option is disabled, you can click on “Custom Color” to activate the color options. Click on the “Document Text” box to open color options.How to Change Text Color using Adobe Reader
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